| two new species of litobothrium dailey, 1969 (cestoda: litobothriidea) from thresher sharks in the gulf of california, mexico, with redescriptions of two species in the genus. | as part of a survey of the metazoan parasites of elasmobranchs of the gulf of california, mexico, the spiral intestines of 10 pelagic thresher sharks alopias pelagicus and one bigeye thresher shark a. superciliosus were examined for tapeworms. eight of the a. pelagicus specimens examined were found to host litobothrium amplifica and l. daileyi. both tapeworm species are redescribed based on examination of this new material with light and scanning electron microscopy, and the ranges of most of th ... | 2001 | 11302614 |
| oceanic sharks clean at coastal seamount. | interactions between pelagic thresher sharks (alopias pelagicus) and cleaner wrasse were investigated at a seamount in the philippines. cleaning associations between sharks and teleosts are poorly understood, but the observable interactions seen at this site may explain why these mainly oceanic sharks regularly venture into shallow coastal waters where they are vulnerable to disturbance from human activity. from 1,230 hours of observations recorded by remote video camera between july 2005 and de ... | 2011 | 21423796 |
| revision of the family sphyriocephalidae pintner, 1913 (cestoda: trypanorhyncha), with the description of heterosphyriocephalus encarnae n. sp. and redescriptions of two species of sphyriocephalus. | the family sphyriocephalidae pintner, 1913, which comprises the genera hepatoxylon bosc, 1811, sphyriocephalus pintner, 1913 and heterosphyriocephalus palm, 2004, is revised from newly-collected and museum material. heterosphyriocephalus encarnae n. sp. is described from the pelagic thresher, alopias pelagicus nakamura (lamniformes: alopiidae) collected from the pacific ocean off boca del alamo, mexico. this species can be readily distinguished from the rest of sphyriocephalids by its small size ... | 2017 | 27609346 |
| estimating finite rate of population increase for sharks based on vital parameters. | the vital parameter data for 62 stocks, covering 38 species, collected from the literature, including parameters of age, growth, and reproduction, were log-transformed and analyzed using multivariate analyses. three groups were identified and empirical equations were developed for each to describe the relationships between the predicted finite rates of population increase (λ') and the vital parameters, maximum age (tmax), age at maturity (tm), annual fecundity (f/rc)), size at birth (lb), size a ... | 2015 | 26576058 |
| age, growth and maturity of the pelagic thresher alopias pelagicus and the scalloped hammerhead sphyrna lewini. | indonesia has the greatest reported chondrichthyan catches worldwide, with c.110,000 t caught annually. the pelagic thresher (alopias pelagicus) and scalloped hammerhead (sphryna lewini) together comprise about 25% of the total catches of sharks landed in indonesia. age and growth parameters were estimated for a. pelagicus and s. lewini from growth-band counts of thin-cut vertebral sections. alopias pelagicus (n = 158) and s. lewini (n = 157) vertebrae were collected from three indonesian fish m ... | 2015 | 25557431 |
| genetic diversity and population structure of the pelagic thresher shark (alopias pelagicus) in the pacific ocean: evidence for two evolutionarily significant units. | there has been an increasing concern about shark overexploitation in the last decade, especially for open ocean shark species, where there is a paucity of data about their life histories and population dynamics. little is known regarding the population structure of the pelagic thresher shark, alopias pelagicus. though an earlier study using mtdna control region data, showed evidence for differences between eastern and western pacific populations, the study was hampered by low sample size and spa ... | 2014 | 25337814 |
| illegal trade of regulated and protected aquatic species in the philippines detected by dna barcoding. | illegal trade has greatly affected marine fish stocks, decreasing fish populations worldwide. despite having a number of aquatic species being regulated, illegal trade still persists through the transport of dried or processed products and juvenile species trafficking. in this regard, accurate species identification of illegally traded marine fish stocks by dna barcoding is deemed to be a more efficient method in regulating and monitoring trade than by morphological means which is very difficult ... | 2016 | 24841434 |
| dna barcoding of shark meats identify species composition and cites-listed species from the markets in taiwan. | an increasing awareness of the vulnerability of sharks to exploitation by shark finning has contributed to a growing concern about an unsustainable shark fishery. taiwan's fleet has the 4th largest shark catch in the world, accounting for almost 6% of the global figures. revealing the diversity of sharks consumed by taiwanese is important in designing conservation plans. however, fins make up less than 5% of the total body weight of a shark, and their bodies are sold as filets in the market, mak ... | 2013 | 24260209 |
| complete mitochondrial genome of the pelagic thresher alopias pelagicus (lamniformes: alopiidae). | the complete mitochondrial genome of the pelagic thresher alopias pelagicus is first presented in this study. it is 16,692 bp in length and contains the 37 genes and 1 control region with the typical gene order and transcriptional direction in the vertebrates. the overall base composition is 32.1% a, 29.3% t, 25.3% c and 13.3% g. totally, 27 bp overlaps and 25 bp short intergenic spaces are dispersal in the mitogenome. the trna-ser2 (gcu) cannot be folded into the typical cloverleaf structure be ... | 2015 | 24047163 |
| thresher sharks use tail-slaps as a hunting strategy. | the hunting strategies of pelagic thresher sharks (alopias pelagicus) were investigated at pescador island in the philippines. it has long been suspected that thresher sharks hunt with their scythe-like tails but the kinematics associated with the behaviour in the wild are poorly understood. from 61 observations recorded by handheld underwater video camera between june and october 2010, 25 thresher shark shunting events were analysed. thresher sharks employed tail-slaps to debilitate sardines at ... | 2013 | 23874415 |
| identification of factors influencing shark catch and mortality in the marshall islands tuna longline fishery and management implications. | recent average annual catches of sharks by tuna longline vessels fishing in the republic of the marshall islands (rmi) are estimated to be between 1583 and 2274 t. although 22 shark species have been recorded by the observer programme for this fishery, 80% of the annual catch comprises only five species: blue shark prionace glauca, silky shark carcharhinus falciformis, bigeye thresher shark alopias superciliosus, pelagic thresher shark alopias pelagicus and oceanic whitetip shark carcharhinus lo ... | 2012 | 22497410 |
| redescription of dinemoura discrepans cressey, 1967 (copepoda: pandaridae) parasitic on four species of sharks off southeast coast of taiwan. | dinemoura discrepans cressey, 1967 (copepoda, siphonostomatoida, pandaridae) is redescribed based on the specimens taken from four species of sharks caught off the southeast coast of taiwan. the four species of sharks are: pelagic thresher, alopias pelagicus nakamura; bigeye thresher, a. superciliosus lowe; blacktip shark, carcharhinus limbatus (müller et henle); and oceanic whitetip shark, c. longimanus (poey). although our redescription shows certain differences from the original description, ... | 2011 | 22263312 |
| application of multiplex pcr approaches for shark molecular identification: feasibility and applications for fisheries management and conservation in the eastern tropical pacific. | here we describe the application of new and existing multiplex pcr methodologies for shark species molecular identification. four multiplex systems (group id, thresher sharks, hammerhead sharks and miscellaneous shark) were employed with primers previously described and some designed in this study, which allow for species identification after running pcr products through an agarose gel. this system was implemented for samples (bodies and fins) collected from unidentified sharks landed in the por ... | 2012 | 22067369 |
| [fishery of oceanic and coastal sharks in colima, jalisco and michoacán]. | shark fishery is one of the most important activities in the mexican pacific coast, nevertheless, there is few data available about the specific captures done by the fleet along the coast. this study describes fishery biology aspects of the shark species catched by the semi-industrial long-line fleet of manzanillo. monthly samplings were made on board of these vessels during an annual period from april 2006 to april 2007. captured species composition (n = 1 962 organisms) was represented by nine ... | 2011 | 21721232 |
| the vascular morphology and in vivo muscle temperatures of thresher sharks (alopiidae). | the thresher sharks comprise a single family (alopiidae) of pelagic sharks most easily recognized by the elongate dorsal lobe of their caudal fin. despite morphological similarities among the alopiids, the common thresher (alopias vulpinus) is unique in that its red, aerobic myotomal muscle (rm) is medially positioned (i.e., closer to the vertebrae), its systemic blood is supplied through a lateral circulation which give rise to counter-current heat exchanging retia, and it is capable of regiona ... | 2011 | 21688299 |
| the red muscle morphology of the thresher sharks (family alopiidae). | a more medial and anterior position of the red aerobic myotomal muscle (rm) and the presence of a vascular counter-current heat exchange system provide the functional elements that facilitate regional rm endothermy in tunas, lamnid sharks and the common thresher shark (alopias vulpinus). the convergent rm morphology among all species capable of rm endothermy suggests that rm position is a strong predictor of fish endothermic capacity. the present study investigated the comparative rm morphology ... | 2005 | 16272248 |